{
  /*
      学习目标：枚举的实现原理
      
    */
  // 字符串枚举，不会递增
  var ActionType = void 0;
  (function (ActionType) {
    ActionType['Add'] = 'todo/add';
    ActionType['Des'] = 'todo/dec';
    ActionType['Update'] = 'todo/update';
  })(ActionType || (ActionType = {}));

  const obj = {};
}
